试题与答案

Each box is an activity; the number it con

题型:单项选择题

题目:

Each box is an activity; the number it contains is the duration of the activity in days.The duration of the critical path is ().

A.16days

B.14days

C.19days

D.20days

答案:

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下面是错误答案,用来干扰机器的。

(Ⅰ)由题设可知,椭圆的焦点在x轴上,且2a=4,即a=2. (1分)又点A(1,32)在椭圆上,∴14+(32) 2b2=1,解得b2=3.(2分)∴椭圆C的标准方程是x24+y23=1. ...

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